Screen.



No. 779,149. PATENTED JAN. 3, 1905.

G. w. (moss.

SCREEN.

APPLIOATION FILED we. 4i 1904.

UNITED Sra rns Patented January 3, 1905.

arnnr @rricn.

SCREEN.

SPECIFICATION forming part of Letters Patent No. 779,149, dated January 3, 1905.

Application filed August 4,1904. Serial No. 219,618.

To all 11/72/0171, it may concern:

Be itknown that I, GEORGE W. Cnoss, a citizen of the United States, residing at Carbondale, Lackawanna county,- State of Pennsylvania, have invented a certain new and useful Improvement in Screens, of which the following is a specification.

The invention relates particularly to screens for the separation of coal into various sizes, although it may to advantage be used in connection with other material.

The object of the invention is to provide a simple but highly-efficient screen construction in which maximum strength will be secured and adequate provision made for the tumbling or agitation of the material in its passage over the screening-surface.

A further object is to accomplish these ends in a screen the perforated surface whereof shallconsist of a number of separate elements, each, however, equipped with the necessary appliances adapting it for ready and convenient application to a screen-barrel.

In carrying out the invention I employ a screen-barrel of any suitable construction and preferably of the revoluble type. The jacket or periphery of such screen-barrel -is covered with a series of segments of punched sheetsteel the end margins whereof are secured to the spider rings or bands of the screen-barrel, the opposite longitudinal edges of such segments being secured in manner hereinafter described to each other. One of the longitudinal edges of each screen-segment has secured to it, either by bolts or rivets or other suitable means, a section of T-iron, the central web whereof is so arranged as to project inwardly toward the axis of the screen. The other webs of such T-iron are perforated to receive bolts or rivets, whereby one of such webs is secured to one side margin of a segment and the other edge, after the segment has been put in position, to the side margin of the next adjacent segment. The central webs of these T-irons projecting between the adjacent edges of the segments form obstructions to the passage of the coal or other material over the perforate surface, and therefore agitate and distribute such material, precluding the riding of small particles on particles of larger size. Additionally, since these T- irons extend between and are connected to the spider-bands of the screen-barrel, they coact with such spider-bands in forming a firm and positive support for the screen-segments.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a cross-section illustrating a screen-barrel equipped with my invention. Figs. 2 and 4 are enlarged details, the former illustrating in end view and the latter in plan view portions of two adjacent segments, a spider-band and a T-iron secured thereto and to such segments. Fig. 3 is a cross-section on the line 3 3, Fig. 4; and Fig. 5 is a perspective view, on reduced scale, of a screen-segment with its T-iron attachment.

A designates the central shaft of the screenbarrel, and B spider-hubs mounted upon said shaft at suitable intervals. Extending from said hubs are spokes Z), the ends whereof are connected by the spider bands C. These spiders and bands are so located relatively to each other as that the end margins of the segments D may be supported upon said bands by means of bolts or rivets (Z. Each segment D is provided with suitable perforations, the margins thereof both transverse and longitudinal being preferably imperforate save for the holes adapted to receive bolts or rivets, as herein stated.

E E designate sections of T-iron, each comprising the base-web e and the central web a. Adjacent to each end of each T-iron section the central inwardly-projecting web a is cut away, as clearly shown in Figs. 3, 4, and 5, in order to facilitate the attachment of such section to the spider-bands. Each T-iron section is provided with perforations preferably spaced to correspond with those formed in the side margins of the screen-segments, as shown in Fig. 4.

In applying the segments and T-iron sections to the screen-barrel the latter will preferably be bolted or riveted to the segments, there being one such section for each segment. The segment and its attached T-iron section may then be applied to the screen-barrel by securing the ends of both outside the spider-bands C. The edge of the next adjacent segment may then be secured in position by merely connecting the T-iron section with the side margin thereof and securing the end margins of such adjacent segment to the spider-band. When so arranged, the central webs e of the T-iron sections will project between the adjacent side margins of the segments and inwardly toward the axis of the screen, thus lying in position to catch the coal as it passes through the screen -barrel and to raise and tumble the same, thereby assuring not only suflicient agitation to promote the screening operation, but also the utilization of the maximum amount of screening-surface, since the material is to some extent carried up around the side of the screen-barrel.

One of the leading advantages of the construction above described, apart from the increase of efiiciency in the screening operation, resides in the fact that the T-iron sections are, in effect, part of the skeleton framework of the screen-barrel binding the spider-bands together, adequately supporting the side margins of the segment, and generally increasing the strength, rigidity,'and durability of the screen-barrel.

Having now described my invention, what I claim as new therein, and desire to secure by Letters Patent, is as follows:

1. In a screen, the combination with a supporting-frame including spider-bands, of T- iron sections connecting said spider-bands, the central webs thereof extending inwardly toward the axis of the screen, and perforate segments extending between said sections, substantially as set forth.

2. In a screen, the combination with a supporting-frame including spider-bands, of T- iron sections connecting said spider-bands, the central webs thereof extending inwardly toward the axis of the screen, and perforate segments extending between said sections and se-' cured both to said sections and to said bands, substantially as set forth.

3. In a screen, the combination with a frame including spider-bands and supporting means therefor, of T-iron sections secured at their ends to said bands and having their central webs cut away at each end and extending inwardly toward the axis of the screen, and perforate segments secured at their ends to said bands, substantially as set forth.

4:. In a screen, the combination with a supporting-frame including spider-bands, of T- iron sections secured at their ends to said bands and having their central webs cut away at each end and extending inwardly toward the axis of the screen, and perforate segments secured at their ends to said bands and at their sides to said T-iron sections, substantially as set forth.

5. In a screen, the combination withaframe including spider-bands, of T-iron sections extending between said bands and having their central webs cut away at the ends and extending inwardly toward the axis of the screen, perforate segments and securing means therefor including bolts passing through said T- iron sections, said bands and the margins of said segments, substantially as set forth.

6. The combination with a screen-segment, of a section of T-iron having a central inwardly-projecting web and two opposite webs lying in substantially the same plane as said segment, one of said last-named webs being secured to the side margin of said segment, the edge of said segment thereby abutting against said inwardly-projecting web, substantially as set forth.

7 The combination with a screen-segment, of a section of T-iron having a central inwardly-projecting web cut away adjacent to each end, and two opposite webs lying in substantially the same plane as said segment, one of said last-named webs being secured-to the side margin of said segment, the edge of said segment thereby abutting against said inwardly-projecting Web, substantially as set forth.

8. The combination with a screen-segment, of a section of T-iron having a central inwardly-projecting web and two opposite webs lying in substantially the same plane as said segment, one of said last-named webs being secured to the side margin of said segment, the edge of said segment thereby abutting against said inwardly-projecting web, and the other being provided with means for attachment to another segment, substantially as set forth.

This specification signed and witnessed this 2d day of August, 1904:.

GEORGE W. CROSS.

Witnesses:

H. T. WOODWARD, JOHN McGoWAN. 

